Peter Drucker on Montessori

The late Peter Drucker, often considered 'the inventor of modern management', was a great admirer of the Montessori method:

For thousands of years people have been talking about improving teaching — to no avail. It was not until the early years of this century, however, that an educator asked, “What is the end product?” Then the answer was obvious: It is not teaching. It is, of course, learning. And then the same educator, the great Italian doctor and teacher Maria Montessori (1870-1952), began to apply systematic analysis of the work and systematic integration of the parts into a process.
— Peter Drucker, Management: Tasks, Responsibilities, Practices (1973)